What you want to grow will depend on your circumstances. How much land you have, the climate, etc. Another thing to consider is how you plan to store your food. Storing food in cold storage is resource intensive and a risk if power is lost even for a few days. Here, in Aus, the fowler preserving system is widely used. I use that to preserve enough tomatoes to feed myself for the year. I really only need to grow half a dozen tomatoe plants. They are preserved simply in jars or cooked down into pasata. Look for storage alternatives that are room temp. Another option is to make sauerkraut. It is simple to make (cabbage + salt), stores well and is good for you. Also kimchi if you like a bit of spice, but that is best stored in the fridge. I tend to avoid crops that are grown commercially locally (potatoes, onions and peas for me) as commercial producers are much more efficient than me and I can buy them locally quite cheaply. Other things you might grow are zucchini (huge yield for little effort), corn, pumpkin, silverbeet, etc. Also perennial herbs like rosemary, sage, thyme, etc.